Solid-state batteries find their way onto the road

Lithium metal solid-state battery Solid-state batteries find their way onto the road

2025-03-06 From Dipl.-Ing. (FH) Michael Richter | Translated by AI 2 min Reading Time

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Solid-state batteries are considered to be the next big milestone in battery development. These batteries are characterized by a higher energy density and enormous robustness. Mercedes-Benz has now announced that the first prototypes are undergoing road tests.

Ready for the road: The EQS is currently weakening in terms of sales figures, but as a technology demonstrator it shows what the next generation of batteries will be capable of.(Image: Mercedes-Benz AG) — Ready for the road: The EQS is currently weakening in terms of sales figures, but as a technology demonstrator it shows what the next generation of batteries will be capable of.
(Image: Mercedes-Benz AG)

In cooperation with Factorial Energy, Mercedes-Benz has developed a prototype vehicle powered by a solid-state lithium-metal battery. This innovative battery system was developed by Mercedes AMG High Performance Powertrains (HPP) and the Mercedes-Benz Competence Center for Battery Systems. The EQS was selected as the test vehicle.

The breakthrough in battery technology

Solid-state batteries use a solid electrolyte instead of a liquid solution. This technology significantly increases safety and energy density compared to lithium-ion batteries. The use of a lithium metal anode is of particular importance, as it enables a significantly higher energy density compared to conventional anode materials. This would make it possible for future electric vehicles to achieve a gravimetric energy density of up to 450 Wh/kg (approx. 204.14 Wh/lb) at cell level and significantly increase their range.

Practical tests and innovations

The prototype of the solid-state battery was installed in an EQS at the end of 2024 after extensive testing on various test benches. The first laboratory tests were carried out in Stuttgart (Germany). Road tests started as early as February 2025.

In contrast to normal vehicle batteries, Mercedes installs the battery on a floating cell carrier. Mercedes-Benz already has a patent for this. The battery cells change their volume during charging and discharging. Pneumatic actuators react to the cell changes and compensate for them. This system is intended to significantly improve the performance and service life of the battery.

Increased efficiency and future prospects

The solid-state battery tested in the EQS offers up to 25% more range without significantly changing the weight or size of the standard EQS battery. Energy efficiency is also increased by passive cooling of the battery. Initial estimates suggest a range of more than 1,000 km (approx. 621 miles).

Mercedes-Benz entered into a partnership with Factorial Energy back in 2021 to investigate this pioneering technology. In the summer of 2024, Factorial provided Mercedes-Benz with the first B-samples of lithium-metal solid-state battery cells with its own "solid-state technology". This was the first global delivery of this type to a major car manufacturer.

A step into the future of electromobility

With this prototype, Mercedes-Benz is setting new standards in the field of electromobility and demonstrating that solid-state batteries are no longer visions of the future, but are already being used in practical applications. Extensive tests over the coming months will show whether this technology is suitable for series production. If it proves successful, it could revolutionize the automotive industry and significantly increase the range and efficiency of electric cars. (mr)

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Date: 08.12.2025

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